linux-kernel - [PATCH] net/bluetooth/cmtp/sock.c: add CAP_NET

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Message-ID: <20200818081555.GA1349@oppo>
Date:   Tue, 18 Aug 2020 16:15:55 +0800
From:   Qingyu Li <ieatmuttonchuan@...il.com>
To:     marcel@...tmann.org, johan.hedberg@...il.com, davem@...emloft.net,
        kuba@...nel.org, isdn@...ux-pingi.de
Cc:     linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] net/bluetooth/cmtp/sock.c: add CAP_NET_RAW check.

When creating a raw PF_BLUETOOTH socket,
CAP_NET_RAW needs to be checked first.

Signed-off-by: Qingyu Li <ieatmuttonchuan@...il.com>
---
 net/bluetooth/cmtp/sock.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/bluetooth/cmtp/sock.c b/net/bluetooth/cmtp/sock.c
index 96d49d9fae96..476ccc9bee7c 100644
--- a/net/bluetooth/cmtp/sock.c
+++ b/net/bluetooth/cmtp/sock.c
@@ -207,6 +207,9 @@ static int cmtp_sock_create(struct net *net, struct socket *sock, int protocol,
 	if (sock->type != SOCK_RAW)
 		return -ESOCKTNOSUPPORT;

+	if (!capable(CAP_NET_RAW))
+		return -EPERM;
+
 	sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &cmtp_proto, kern);
 	if (!sk)
 		return -ENOMEM;
--
2.17.1